How do paper airplanes fly?

paper airplanes fly depending on their wing angle (dihedral), weight, and wing design.

small paper planes wings go faster if you put some weight in the front. paper planes

with large wing glide more slowly and float. if its windy outside you may be lucky

enough to throw it and the wind will pick it up.
They have wings that create lift for the airplane to stay in the air.
Newtonian lift and pressure differential above and below the aircraft's wings.